Improvement in purifying illuminating-gas



tit saw:

aw I @atmt (Mae. 3;

Letters Patent No. 83.417, acted October 27, 1868.

IMPROVEMENT IN PURIPY-ING- ILLUMINATING- G-AS.

The Schedule referred ,to in these Letters Patent and making part of the same.

To an whom it may concern;-

Be it known that I, PETER SPENOE, of Newton Heath,- Manchester, in the county of Lancaster, England, have invented a new and useful Improvement in the Mode of Purifying Illuminating-Gas, for which I have received Letters Patent fi'om the English Government, N 0. 1,361, and dated April 25, 1868; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to the application of a certain material or materials for purifying gas, whereby it is deprived of sulphuretted hydrogen. For this purpose I employ protosilicates and protocarbonates of iron, in a native state, or as they arise from manufacturing processes. The substance I especially use is the slag which arises from regulus during the process of smelting copper ores, and which is the silicate. of-

iron required. The slag, also, which arises from the puddling of iron, and commonly called .tap-cinder, is a similar substance, and will answer the purpose of my invention.

'Ih'e photomrbonates Iuse may be defined by the Cleveland and black-band iron-stone.

'ln eolnlucting'my process, I grind the material into small particles, and diffuse it in the purifier'ordinarily used in the nianufi'tcture of gas for illumination.

In purifying gas from sulphur, I grind the copper slag to a suitable fineness, say tillit passes tl'n'ough a sieve of eighty (80) holes to the inch lineal; but the iron slag or tap-cinder and the natural photocarbonates of iron are sufliciently ground if theypass through a sieve of twenty (20) holes to'tl1e inch lineal. I use them on the. usual form of purifiers,j(first damping them with water,) and after being used uutil they take up no more sulphur, they are removed from the purifiers, and spread upon the ground, and damped with water, then turned over once or twice. and in a few hours they change color, and are again ready for the purifiers, and may be so used from iiity to a'hundred times, or until they become charged with sulphur tofrom sixty-five to seventy-five per cent. They'will then be worth from twenty (20) to twenty-five (25) dollars per ton for the manufacture of sulphuric acid. I use fifty (50) tons per we'ek of them for this purpose.

In addition to the purposes above specified, two most copper slag is ground, and. for the new purpose it is 'quite sufficient that they each be passed through a dred to the square inch.) A given weight of sulphuric acid is taken, of the specific gravity of 1.6, (or 120 Twaddles hydrometer.) Into this acid (cold) is stirred an equal weight of the ground slag. Heatzis and when returned from the gas-works it will contain over half its weightof sulphate of ammonia, and will 'be worth thirty (30) to forty (40) dollars per ton as an agricultural fertilizer or other uses. Having thus fully described my invention, What I claim as new, and desire to secure by Letters Patent, is- 1 The use of protosilicates and protocarbonates of iron, specially the slags before mentioned, for purifying gas, for lighting, from s'ulphuretted hydrogen, and also the use of these substances, as specified, for the productof dry copper-as, or the copperas of coming gas from ammonia.

' V PETER SPENOE.

Witnesses:

WM. TUDOR MABLEY, Manchester.

W. '1. CHEETHAM, Manchester.

valuable applications of it may be made. The iron or sieveof twenty (20) holes to the inch lineal, (four hunevolved, and the mixture is allowed to stand for, say,-

sawdust, but no sawdust is required for this powder,

merce, and the use of said dry copperas' for purify- 

